Arapaima fish

Arapaima fish is native to the Amazon basin of South America. It is one of the largest freshwater fish in the world. Adult fish can reach 2-6 meters in length and weigh up to 100 kilograms. The body is huge, long, and slightly flat. The head bone consists of free slab bone. The mouth is big, no need. There is no mandible and there are strong and developed teeth on the tongue. There are blood vessels around the sputum, the inside is honeycomb-shaped, and there are often special squatters. The scales are large and hard, inlaid. The dorsal and anal fins are located at the back of the body and are opposite each other. The pectoral fin is low. The pelvic fins are behind the abdomen. The caudal fin is round. The body is grayish green, the back color is dark, the abdomen is light, and the caudal fin and the back of the body are red. During the reproductive season, the eggs are burrowed and the males are protected for 2-3 months. They can only leave after the juveniles can live independently.

Arapaima fish lives in the world's most primitive tropical jungle waters, mainly feeding on small fish, but occasionally preys on snakes, turtles, frogs and insects, and even prey on small crocodiles. Due to the hot weather, the oxygen content of the slow-flowing river water is reduced, and the Arapaima fish needs to float from the surface to swallow the air to breathe. In the dry season, it can also rely on drilling holes in the sand to protect it. The Arapaima fish has a powerful brute force. Using the tail as a weapon, it can easily knock down adult males and crush bones to cause a lot of internal injuries. Arapaima fish has enormous economic value. An Arapaima fish has an average of 70 kilograms of fish. In Brazil, indigenous people can kill a certain number of Arapaima fish as a food, with the permission of the local government, but the quantity and size of the fish are strictly limited.

Arapaima fish belongs to the remains of ancient paleo-water fish. It is supposed to have appeared 100 million years ago. Because of the growth of hard bones in the tongue, such fish are called bone fish. The Arapaima fish mainly occurs in the banks of the Amazon basin, but the exact age of the distribution, especially in the lower part of the basin, is unknown. It was first recorded in the Essequibo basins in Guyana. Outside its native range, the Arapaima fish has been introduced to rivers and fisheries in Asia, and is also farmed in aquariums for viewing. Field catches have fallen sharply, and in the Amazon basin of Brazil and Colombia, this fish domestication is gradually evolving to alleviate this.